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[PROBLEM] Multiroom floods Network with UDP Multicast

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Problem: Multiroom floods Network with UDP Multicast
tropappar Offline
Junior Member
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Posts: 22
Threads: 7
Joined: Dec 2024
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#1
04-05-2025, 08:29 AM
Dear all,

I noticed when running the multiroom sender daemon, I have a very high rate (~50 Hz) of UDP packets (regardless of whether I'm playing anything or not).

Here is a short excerpt (~1.2 s) of the packet capture:

Code:
No.     Time            Source          Destination     Prot.   Lenght  Info
21535    367.838666899    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21536    367.854766024    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21537    367.878654377    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21538    367.894669553    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21539    367.919644223    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21540    367.934925572    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21541    367.958855481    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21542    367.975273294    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21543    367.999191819    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21544    368.014752255    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21545    368.038696412    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21546    368.054777657    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21547    368.078904100    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21548    368.094927238    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21549    368.118880963    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21550    368.134900468    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21551    368.158898054    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21552    368.174790587    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21553    368.198915005    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21554    368.214893444    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21555    368.238934610    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21556    368.254926529    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21557    368.278681833    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21558    368.294671377    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21559    368.318675946    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21560    368.334801541    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21561    368.359013820    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21562    368.374787274    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21563    368.398930898    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21564    368.414760015    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21565    368.439055754    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21566    368.455045508    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21567    368.478685504    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21568    368.494927734    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21569    368.518934190    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21570    368.534927574    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21571    368.558681971    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21572    368.574731858    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21573    368.598886797    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21574    368.614762079    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21575    368.638936504    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21576    368.654911241    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21577    368.678946401    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21578    368.694836490    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21579    368.718926755    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21580    368.734921746    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21581    368.758694931    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21582    368.774672741    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21583    368.799002493    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21584    368.814979954    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21585    368.838681760    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21586    368.854834733    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21587    368.878961106    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21588    368.894880669    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21589    368.918948235    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21590    368.934965716    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21591    368.959006742    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21592    368.974782012    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21593    368.998937020    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21594    369.014921465    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15
21595    369.038902707    192.168.1.132    239.0.0.1    UDP    60    44167 → 1350 Len=15


This is the payload data of an exemplary short packet (15 Byte) when I'm not playing anything:

Code:
0000   80 00 ed 37 00 94 42 60 3a b6 e2 1a fc ff fe      ...7..B`:......



And this is the payload data of an exemplary long packet (~300 Byte) when I'm playing an internet radio stream:

Code:
0000   80 00 c4 74 00 7a c8 80 3a b6 e2 1a fc d0 07 2a   ...t.z..:......*
0010   15 38 f8 ce 8c 08 a4 61 56 af 88 32 39 c5 9f 69   .8.....aV..29..i
0020   97 6e 94 ed 49 b2 ef ac e1 f9 8a bf 07 02 86 5c   .n..I..........\
0030   08 03 af 5f 59 3c 36 99 ba 39 d0 e0 9a 3f b5 6f   ..._Y<6..9...?.o
0040   b6 45 67 42 69 11 ff 17 d6 0f b6 af df 06 ac 91   .EgBi...........
0050   ec f1 e0 69 ac e4 b3 70 7d c0 3a 5b 45 b9 93 35   ...i...p}.:[E..5
0060   2d 80 72 30 6c be 07 8a b5 c4 40 c9 1f af e1 af   -.r0l.....@.....
0070   08 f2 3d c5 6e 09 5c 24 e4 dd d3 45 3c 7e c9 b5   ..=.n.\$...E<~..
0080   e9 88 70 a4 cd 29 bf 74 c4 90 65 e1 d7 ff 0d fa   ..p..).t..e.....
0090   5f 1f 12 dc 66 6e 9b 7f 9a 7d cb c8 bf 68 ed 8c   _...fn...}...h..
00a0   cf a2 e1 57 0e c0 51 2f 2d a4 43 a0 83 5b 05 fb   ...W..Q/-.C..[..
00b0   50 0f 26 40 59 a6 92 b6 96 50 02 9a f6 59 5b 0d   P.&@Y....P...Y[.
00c0   31 8f ff 8c 21 03 bb 45 d7 7c 92 cb d0 7b dc c1   1...!..E.|...{..
00d0   0c 2b 35 6e 89 a6 c3 fb 11 b5 d5 ef 24 a8 72 dd   .+5n........$.r.
00e0   44 49 a2 12 08 43 25 37 ec a8 70 1d c6 d4 bf df   DI...C%7..p.....
00f0   9a a7 91 d9 4e 9d 0c                              ....N..


And this is my multiroom configuration:

Code:
[Multiroom]
multiroom_tx = "On"
multiroom_rx = "Disabled"
multiroom_tx_bfr = "64"
multiroom_tx_host = "239.0.0.1"
multiroom_tx_port = "1350"
multiroom_tx_sample_rate = "48000"
multiroom_tx_channels = "2"
multiroom_tx_frame_size = "960"
multiroom_tx_bitrate = "128"
multiroom_rx_bfr = "64"
multiroom_rx_host = "239.0.0.1"
multiroom_rx_port = "1350"
multiroom_rx_jitter_bfr = "64"
multiroom_rx_sample_rate = "48000"
multiroom_rx_channels = "2"
multiroom_initial_volume = "20"
multiroom_tx_rtprio = "45"
multiroom_tx_query_timeout = "1"
multiroom_rx_frame_size = "960"
multiroom_rx_rtprio = "45"
multiroom_rx_alsa_output_mode = "plughw"
multiroom_rx_mastervol_opt_in = "1"
rx_hostnames = "moode-kueche, moode-wohnzimmer"
rx_addresses = "192.168.1.33 192.168.1.34"



Is this normal? It seems like it is needlessly flooding my network.
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Tim Curtis Online
moOde audio founder
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Posts: 14,593
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Joined: Mar 2018
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#2
04-05-2025, 11:06 AM
Looks like some sort of "idle" traffic from trx sender. Its a minuscule amount of bandwidth and so won't have any affect on network performance.

If you want to examine the code, the sender (tx.c) source is below.
https://github.com/bitkeeper/trx/blob/fe.../tx.c#L178
Enjoy the Music!
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tropappar Offline
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#3
04-08-2025, 06:13 PM
Indeed, it is not a lot of throughput, roughly:
  • 24 kbit/s in idle
  • 1 Mbit/s when streaming
Nevertheless my unmanaged switch is constantly blinking like a Christmas party on all ports. Probably due to the high rate of the packets.
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